The Defense Research and Engineering Network (DREN) — a high-speed national computer network for computational research, engineering, and testing — is a significant program within the HPCMP. The DREN is the United States Department of Defense’s research and engineering computer network. The DREN is a high-speed, high-capacity, low-latency nationwide computer network for computational scientific research, engineering, and testing in support of the DoD's Science and Technology and Test and Evaluation communities. The DREN connects scientists and engineers at the HPCMP's geographically dispersed high performance computing (HPC) user sites, including the five DoD Supercomputing Resource Centers — hosted by the Army Research Laboratory, Engineer Research and Development Center, Naval Meteorolog